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0. H. MACKUN. APPARATUS ron Pnouucm wm Russ-ER SHEETS.

APPUCATION HLED MAR. 16,1921. ,75; Patented July 4, 192.2.

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APPARATUS FOR PRODUCING THIN' RUBBER SHEETS- APPLICATION HLEDMAR. 16,4921.

1,421,7 95. Patented July 4, 1922.

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amJMMmm MWMW ' o. H. MACKLIN. APPARATUS FOR PRODUCING `[H |N RUBBER SHEETS.

APPLICATION FILED MAR. 1.6, 1921.

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OTTO EI. MIACKLIN, OF AKRON, OHIO, ASSIGNOR TO THE MILLER RUBBER COMPANY,

I OF AKRON, OHIO, .A CORPORATION OF OHIO.

.APPARATUS FOR PRODU'CNG THN RUBBER SHEETS.

ino-@ZZ whom it may concern Be it known that I, OTTO H. MAGKLIN, a citizen of the United States, and a resident of Akron, in the county of Summit and State of Ohio, have invented certain new and useful lmprovements in Apparatus for Producing -Thin Rubber Sheets, of which the following is a specification.

My present invention relates toimprovements in apparatus designed for the production of thin sheet rubber such as is used in the manufacture of bathing caps and other articles requiring rubber sheeting of this character. Such rubber sheeting is eX- tremely difficult to handle owing to its eX- treme thinness and its sticking nature. lt is also difficult, if not impossible, to manufacture without defects occurring at times in the sheeting, which defects, such as pin holes and the like, are not readily observable, and yet, if present in the article made from the sheeting, will render it defective and unsalable. The present invention aims to provide apparatus by which such sheeting may be rapidly and economically manufactured in such condition as to prevent the sticking of the sheets and including means by which defeets in the sheet may be readily ascertained and defective portions removed.

With these and other objects in view which will hereinafter appear, the invention includes the novel features ofconstruction and arrangement and' combination of parts here inafter described and particularly defined by the appended claims.

An embodiment of my invention is illustrated in the accompanying drawings in which- Figure 1 is a side elevation of apparatus constructed in accordance with my invention, the calender rollsbeing shown largely of adiagrammatic'nature, the means for operating the rolls forming no part of the present invention.

Fig. 2 is an end view of the dust removing and inspection apparatus detached from the calender rolls, and

Fig. 8 is a plan view of the same.

Referring by reference characters to these drawings, the numeralsA l and 2 designate coacting calender rolls which may be mounted and driven in the ordinary or any desired Specification of Letters Patent.

Patented July a, i922?.

Application filed March 16, 19551. Serial No. 452,884.

manner, and which are designed to form be tween them a thin film or sheet of rubber in dicated at 3 which is formed by the action of the rolls on the bank of rubber compound 3a in the customary manner. Coacting with roll 2 is a brush 4 disposed longitudinally of the roll and bearing on the exposed surface of the sheet above which brush l dispose a bank 5 of powdered material designed to coat the surface of the sheet and prevent sticking thereof during manipulation, the powdered material being confined at the ends by blades of members 6 adjustably mounted on a supporting rod 6, such shaft being also provided with knives Gb designed to trim the edges of the sheet formed by the rolls. Beneath the roll 2 is an additional roll 7 to which the rubber sheet is conveyed having first been passed around an idle cloth covered roll 8 journalled preferably in ball bearings and which cloth covered roll serves to deflect the severed margins which are indicated at 3b and which may be conveyed into receptacles to be reworked and incorporated with fresh rubber stock.

The sheeting 3 in passing around the additional roller 7l1as its opposite or unpowdered face exposed, and associated with this roll 7 is another brush lL for applying powdered material to the other face. Also associated with said roll 7 are cloth covered presser rolls 8 and 9 which are designed to coact therewith to carry the'sheet around the roll and draw it past the brush et, as owing to the fact that the face which is adjacent to the roll 7 has been previously coated with powdered material, it wouldnot adhere to said roller. From the cloth covered roll 9 the sheet is conveyed to the dust removing and inspection apparatus'which will now be described.

At 10 is shown a frame work or table which is preferably supported upon wheels or casters 11 so as to enable it to be juxtaposed to or removed from the calender means heretofore described, said frame being supplied with means for holding it rigidly in position, such for example as floor engaging bolts or devices l2. This table or frame carries at one end, preferably on a hinged eX- tension l()n a pair of guide rolls 13 journalled in a swinging standard frame 'la held in desired position by rod or prop 15. The sheet 3 is carried past these rollers onto the table and under guide roll 16 and then through a slot in a box or casing 17 carried by the table and disposed transversely thereof. The sheet is preferably arranged to enter the casing on one side near the bottom and to 'leave von the opposite side near the top connected by an exhaust pipe 19 with the casing of a suction fan indicated at 20 which withdraws the surplus powdered material stirred up by the brushes, and ejects it through pipe 21 by which it may be conveyed to a dust collector for reuse.

After leaving the exit slot in the casing 17 the sheet passes over guide roller 2l"l and downwardly in an inclined direction and under guide roller22 and in rear of such downwardly inclined portion of the sheet is located illuminating means, such as a row of incandescent lamps indicated at 23.

By looking at the portion of the sheet in front of these lamps the attendant can determine whether or not any imperfections exist in the sheet as pin holes will show up as distinct dots of light while any foreign matter or wrinkles will appear as dark spots or streaks. As a double safe guard I prefer to provide the table top. with an opening covered by a glass plate 24 beneath which is located other illuminating means such as another row of incandescent lights 25. At

the extremity of the table is located a flat steel bar or plate 2G over which the sheet passes and beneath an upper steel bar 27 of less width. The table is provided with bracket extensions 29 which support a winding roller 30 or drum which may be conveniently rotated by hand.

If, during the operation of the machine the attendant or attendants see a stretch of material of defective quality, the operator stops winding and the material coming through the machine is gathered into a loop until portion of good quality appears. By the use of a knife, preferably a roller knife acting on the stock in connection with the bar 26 which acts as a die plate (bar 27 serving as a guide for the knife) the loop of defective stock is severed from the good stock and the severed portions of the good stock are united simultaneously therewith by the action ofthe cutting knife.

I prefer to drive the brushes, fan, etc. carried by the table by an electric motor shown conventionally at 31 and connected with the various parts through belt connections as shown.

Having thus described my invention,what I claim is:

1. Apparatus of the class described comprising calender means for forming rubber compound into a thin sheet, means associated with the calender means for applying powdered material to the sheet being formed thereby, and means for removing the surplus powder from the surface of the sheet.

2. Apparatus of the class described comprising calender means for forming rubber compound into a thin sheet, means associated with the calender means for applying powdered material to both surfaces of the sheet, and means for removing surplus powder from said surfaces.

3. Apparatus of the class described comprising calender means for forming a thin sheet of rubber compound, means for applying powdered material thereto, means for removing surplus powder from said sheet, and a source of light over which said sheet passes.

4. Apparatus of the class described con prising calender rolls for forming a thin sheet of rubber compound, means coacting with the calender rolls for applying powdered material to the sheet being formed thereby and means for removing surplus powder from said sheet, including suction apparatus.

Apparatus of the class demribed comprising calender means for forming a thin sheet of rubber compound, means for applying powdered materialthereto, a closed chamber through which said sheet passes, brush means in said chamber eoacting with said sheet to remove surplus dust therefrom, and suction means connected with said chamber.

G. Apparatus of the class described comprising calender rolls for forming rubber compound into a thin sheet, brush means coacting with one of said rolls arranged to form a bank of pulverulent material against the surface of the sheet, and means for removing the surplus material from said sheet.

7 In apparatus of the class described, a pair of calender rolls for forming rubber compound into a thin sheet, means associrated with one of said rolls for applying powdered material tothe surface of said sheet, an additional spaced roll around which said sheet is guided to expose its unpowdered face, means associated with said additional roll for applying powdered material to said other face of the sheet, and mears for removing surplus powdered materia 8. In apparatus of the class described, a

pair of calender rolls forl forming rubber compound into a thin sheet, means associated with one of said rolls for applying powdered material to the exposed face of said sheet, a spaced idle roll over which the calender sheet passes trimming means associated with one of the sheet forming rolls, an additional spaced roll over which the trimmed sheet passes and means associated with said additional roll for applying powdered material to the other face of the sheet.

9. In apparatus of the class described, a pair of calender rolls for forming rubber compound into a thin sheet, a brush arranged to bear on the surface of said sheet while on the roll and to support a bank of powdered material thereagainst and means cooperating with said brush to maintain the banlr of material against endwise displacement.

10. In apparatus of the class described, a pair of calender rolls for forming a bank of rubber into a thin sheet, brush means associated with one ofsaid rolls for applying powdered material to the surface thereof, an additional spaced roll over which said calendered sheet passes in re- Verse position, brush means associated with said additional roll for applying powdered material to the other surface of the sheet means for applying powdered material to f the opposite faces of a sheet and means for removing surplus material therefrom, comprising a closed chamber, means for passing the sheet through said chamber, means for agitating the powdered material on the surfaces of the sheet while in said chamber and suction means connected with said chamber.

12. ln apparatus of the class described, means for forming rubber compound into a thin sheet, electric illuminating means, and means for passing said sheet in exposed position over said illuminating means.

13. Apparatus for manipulating a thin sheet or iilm of rubber comprising an illuminating device, means for continuously feeding the sheet over said illuminating device, a winding roller for winding up the sheet, and means for effecting the severing of the sheet to remove portions found on inspection to be defective.

In testimony whereof, aiiix my signature.

OTTO H. MACKLIN. 

